Drill-jar.



E. L. CLEVELAND.

DRILL JAR. I APPLICATLQN FILED FED-17. 1915- Patented June 29, 1915.

1 19 T111 M A J mdfud f [Kare/07w! ERASTUS L. CLEVELAND, OF WESTCHICAGO, ILLINOIS.

DRILL-JAR.

Specification of Letters Patent.

Patented June 29, 1915.

Application filed February 17, 1915. Serial No. 8,796.

To al whom it may concern:

Be it known that I, ERASTUS L. CLEVE- LAND, a citizen of the UnitedStates, residing at West Chicago, in the county of Dupage and State ofIllinois, have invented certain new and useful Improvements inDrillJars, of which the following is a specification.

This invention relates to devices for connecting a well-drilling tool tothe drill'rope in such a manner that the tool is jarred during thedrilling operation.

The object of the present invention is to provide a novel and improveddrill jar and rope socket combined, which is highly efii- (rient inoperation and simple in construction, this object being attained bymeans of a combination and arrangement of parts to be hereinafterdescribed and claimed, reference being bad to the accompanying drawmgforming a part of this specification.

In the drawing, Figure l is an elevation of the device, and Fig. 2 is acentral vertical section thereof.

Referring specifically to the drawing. 5 denotes a stem having at itslower end a longitudinal cavity 6 in which works a jarhead 7 carried bya wire rope S. The stem has a central longitudinal passage 9 extendingfrom its upper end and opening into the cavity (3, through which passagethe rope loosely extends. The lower end of the cavity is threaded, asindicated at 10, for attachment of the drill or other tool, the latterbeing thus carried by the stem 5.

The stem 5 is not directly connected to the drill-rope 11, a socketmember 12 being provided to which said rope is connected, and saidmember carrying the suspension rope 8 of the stem 5. This socket memberhas a longitudinal passageway 13 which opens at its lower end into acavity 14% in the lower end of the member, in which cavity the upper endof the stem 5 is-slidably mounted. Where the passageway 13 opens intothe cavity 14, it is reduced to form an inverted conical cavity 15 inwhich the upper end of the rope 8 is made fast-by being spread thereintoand soldered or babbitted, the solder or Babbitt metal being poured inthrough a duct 16 extending laterally from the cavity and openingthrough the side of the member 12. The passage 13, intermediate itsends, has a lateral branch in which the rope 11 is made fast in theordinary manner.

It will be evident from the foregoing that a, loose connection betweenthe stem 5 and the drill rope 11 is provided, so that when the latter isoperated the head 7 and the opposite inner wall of the cavity 6 strikeand then separate, whereby the drill or other tool carried by the stemis jarred. The stem is guided by the cavity 14 in the socket memher 12,and the length of the rope S is such as to give the stem sufficienttravel to produce an effective jar. The structure also enables a heavyrope 11 to be used and a iighter rope 8 for the suspension of the stem5.

I claim 1. The combination of a well-drilling toolstem having a cavity,a 1arring head in the cavity, a suspension means connected to thejarring head. and a drillrope socket member having a bottom cavity inwhich the upper end of the tool stem is slidably mounted, to whichmember the aforesaid suspension means is connected.

2. The combination of a well-drilling toolstem having a cavity, ajarring head in the cavity, a drill-rope socket member having a bottomcavity in which the upper end of the tool-stem is slidably mounted, anda connection between the socket member and the jarring head.

The combination of a well-drilling toolstem having a cavity, a jarringhead in the cavity, a drill-rope socket member having a bottom cavity inwhich the upper end of the tool-stem is slidably mounted, and asuspension rope carrying the jarring member and connected to the socketmember at the upper end of its cavity. 7

In testimony whereof I aifix my signature in presence of two witnesses.

ERASTUS L. CLEVELAND.

Witnesses:

L. A. WIANT, DAVID BLAIR.

